Table 2. Photophysiological features of the six marine Synechococcus strains, acclimated at 22 °C under 80 μmol photons m⁻² s⁻¹.

Strain	A15-37	M16.1	WH7803	ROS8604	MVIR-16-2	MVIR-18-1
Orange fluorescence	0.05±0.01	0.18±0.01	0.80±0.06	1.10±0.22	0.45±0.04	0.21±0.07
PE:PC	2.70±0.10	3.50±0.70	2.00±0.20	2.70±0.20	2.40±0.10	2.00±0.30
Fv:FM	0.64±0.03	0.57±0.07	0.61±0.07	0.53±0.03	0.57±0.01	0.60±0.02
NPQST	0.48±0.04	0.20±0.07	0.47±0.09	0.36±0.01	0.43±0.02	0.50±0.01
Chl a (fg cell−1)	2.21±0.81	2.62±0.81	17.5±1.41	9.52±1.61	2.75±0.39	5.57±0.26
Zeaxanthin (fg cell−1)	1.47±0.54	2.06±0.59	5.20±0.62	6.54±1.71	2.05±0.25	3.05±0.07
β-Carotene (fg cell−1)	0.08±0.01	0.15±0.05	1.16±0.16	0.88±0.09	0.22±0.02	0.40±0.02
Zeaxanthin: Chl a (g/g)	0.67±0.07	0.80±0.06	0.30±0.03	0.69±0.08	0.75±0.03	0.53±0.04
β-Carotene: Chl a (g/g)	0.059±0.028	0.085±0.010	0.070±0.001	0.094±0.018	0.081±0.004	0.071±0.02

Abbreviations: PC, phycocyanin; PE, phycoerythrin.